Unless you've been living in a cave for the last few years, you've probably at least heard the word "VoIP" even if you didn't understand what all the excitement is about. Unless you've been living in a cave for the last few years, you've probably at least heard the word "VoIP" even if you didn't understand what all the excitement is about.

VoIP stands for "Voice over Internet Protocol" and it's going to change the way you think about making long distance phone calls.

Basically, VoIP technology turns analog audio signals (like the sounds you hear when talking on your regular telephone) into a digital signal (which is then transmitted over the Internet.)

So why is VoIP revolutionizing the industry? Because it means that by getting your hands on some of the free software that's available right now, you can totally bypass your telephone company, and start making long distance phone calls for free!

Here's what's got the bats buzzing in the belfry:

This revolutionary technology has the ability to totally change the phone system of the entire world! Maybe you've seen television commercials for one of the pioneers of VoIP - Vonage. Vonage brands itself as the "broadband telephone company", and offers enticing perks to customers who switch to its service, like low-cost 800 numbers, very cheap international rates (fees are waived from the U.S. to Canada, and how about .03 cents a minute to call Paris?)

But Vonage isn't the only company who is interested. AT&T is setting up VoIP calling in several areas of the U.S. and there are other major players on the scene as well, such as Skype, who is relying on viral advertising to get the word out.

One of the really interesting thing about VoIP is that there's not just one way to make a call. There are actually three:

ATA - is the most commonly used VoIP method right now. Using the ATA (analog telephone adaptor), you connect your regular telephone to your computer or Internet connection. The ATA is an analog-to-digital converter and it takes the analog signal from your phone and converts it into digital data and transmits it over the Internet.

This is how Vonage does it, and AT&T 's CallVantage will be doing it. The ATA is free with their services. And using an ATA is so simple that anyone can do it. Open the box, plug the cable from your phone into the ATA instead of the wall socket, and you're set. Depending on your computer, and where you live, and what type of Internet connection you have, you might have to also install the software onto your computer, but even my grandmother knows how to do that these days.

IP Phones - They look just like the phones we're used to. They have a handset, cradles and buttons. But an IP phones use an RJ-45 Ethernet connector instead of the standard RJ-11 phone connectors. They connect directly to your router and all the hardware and software is already built inside to handle your IP calls. Look for Wi-Fi IP phones to be available in the near future, which will allow you to make VoIP calls from any Wi-Fi spot. (Can you see the power of that? Just take your IP phone with you when you travel, and stop in at any Internet cafй, hotel or other location where you can use your Wi-Fi laptop, and you can "phone home" wherever home happens to be!

Computer-to-Computer. This is arguably the easiest way to use VoIP. Not only do you not have to pay for long distance calls, there are several companies that are offering free or low-cost software right now for you to make use of the VoIP technology. All you need is the software, a microphone, speakers a sound card and a broadband or cable DSL Internet connection, and your loved ones sound as if they're in the next room. And, except for your normal monthly ISP fee, there is no charge for any computer-to-computer call